GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1

Description

This dataset contains Global Ecosystem Dynamics Investigation (GEDI) Level 4A (L4A) Version 2 predictions of the aboveground biomass density (AGBD; in Mg/ha) and estimates of the prediction standard error within each sampled geolocated laser footprint. In this version, the granules are in sub-orbits. The algorithm setting group selection used for GEDI02_A Version 2 has been modified for Evergreen Broadleaf Trees in South America to reduce false positive errors resulting from the selection of waveform modes above ground elevation as the lowest mode. The footprints are located within the global latitude band observed by the International Space Station (ISS), nominally 51.6 degrees N and S and reported for the period 2019-04-18 to 2023-03-16. The GEDI instrument consists of three lasers producing a total of eight beam ground transects, which instantaneously sample eight ~25 m footprints spaced approximately every 60 m along-track. The GEDI beam transects are spaced approximately 600 m apart on the Earth's surface in the cross-track direction, for an across-track width of ~4.2 km. Footprint AGBD was derived from parametric models that relate simulated GEDI Level 2A (L2A) waveform relative height (RH) metrics to field plot estimates of AGBD. Height metrics from simulated waveforms associated with field estimates of AGBD from multiple regions and plant functional types (PFTs) were compiled to generate a calibration dataset for models representing the combinations of world regions and PFTs (i.e., deciduous broadleaf trees, evergreen broadleaf trees, evergreen needleleaf trees, deciduous needleleaf trees, and the combination of grasslands, shrubs, and woodlands). For each of the eight beams, additional data are reported with the AGBD estimates, including the associated uncertainty metrics, quality flags, model inputs, and other information about the GEDI L2A waveform for this selected algorithm setting group. Model inputs include the scaled and transformed GEDI L2A RH metrics, footprint geolocation variables and land cover input data including PFTs and the world region identifiers. Additional model outputs include the AGBD predictions for each of the six GEDI L2A algorithm setting groups with AGBD in natural and transformed units and associated prediction uncertainty for each GEDI L2A algorithm setting group. Providing these ancillary data products will allow users to evaluate and select alternative algorithm setting groups. Also provided are outputs of parameters and variables from the L4A models used to generate AGBD predictions that are required as input to the GEDI04_B algorithm to generate 1-km gridded products.

Resources

Name Format Description Link
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.3334%2FORNLDAAC%2F2056
21 This link allows direct data access via Earthdata login https://daac.ornl.gov/daacdata/gedi/GEDI_L4A_AGB_Density_V2_1/
21 ORNL DAAC Data Set Documentation https://daac.ornl.gov/GEDI/guides/GEDI_L4A_AGB_Density_V2_1.html
21 USE SERVICE API https://opendap.earthdata.nasa.gov/
33 GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1: GEDI_L4A_V2_Product_Data_Dictionary.pdf https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/GEDI_L4A_V2_Product_Data_Dictionary.pdf
21 GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1: list_of_deleted_files_mw_163_182.txt https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/list_of_deleted_files_mw_163_182.txt
21 GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1: list_of_deleted_files_orbits_17591_09899.txt https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/list_of_deleted_files_orbits_17591_09899.txt
21 GEDI Project Site https://gedi.umd.edu
21 Data set Landing Page DOI URL https://doi.org/10.3334/ORNLDAAC/2056
33 GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1: GEDI_L4A_V2_Common_Queries.pdf https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/GEDI_L4A_V2_Common_Queries.pdf
33 GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1: GEDI_ATBD_L4A_v1.0.pdf https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/GEDI_ATBD_L4A_v1.0.pdf
33 GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1: GEDI_L4A_AGB_Density_V2_1.pdf https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/GEDI_L4A_AGB_Density_V2_1.pdf
21 GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1: list_of_revised_files_mw_163_182.txt https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/list_of_revised_files_mw_163_182.txt
21 GEDI L4A Footprint Level Aboveground Biomass Density, Version 2.1: list_of_revised_files_orbits_17591_09899.txt https://data.ornldaac.earthdata.nasa.gov/public/gedi/GEDI_L4A_AGB_Density_V2_1/comp/list_of_revised_files_orbits_17591_09899.txt
34 Example subset of aboveground biomass density (AGBD; Mg ha-1) predictions from the GEDI Level-4A footprint product over Northern California, U.S., spanning April to July 2019. GEDI footprints are spaced 60m along-track and 600m across-track. https://daac.ornl.gov/GEDI/guides/GEDI_L4A_AGB_Density_V2_1_Fig1.png

Tags

  • ecosystems
  • biosphere
  • spectral-engineering
  • vegetation
  • lidar
  • earth-science

Topics

Categories